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An engine absorbs It must be +8 J/K or more. It must be zero. Need Help?...

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an engine absorbs
It must be +8 J/K or more. It must be zero. Need Help? Read It 5. + 1/3 points Previous Answers SerPSE9 22.P.005. My Note An
It must be +8 J/K or more. It must be zero. Need Help? Read It 5. + 1/3 points Previous Answers SerPSE9 22.P.005. My Note An engine absorbs 1.71 kJ from a hot reservoir at 277°C and expels 1.18 kl to a cold reservoir at 27°C in each cycle. (a) What is the engine's efficiency? % 31 (b) How much work is done by the engine in each cycle? X Enter a number. differs from the correct answer by more than 100%. J (C) What is the power output of the engine if each cycle lasts 0.304 s? kW Need Help? Read It Submit Answer Practice Another Version Submit Assignment Save Assignment Progress

Answers

b) work done by the engine in each cycle = change in Q

W= \Delta Q = Q_1- Q_2 = 1.71 kJ - 1.18 kJ= 0.53 kJ.  

c) power output of engine =

Power = \dfrac{Work}{time}

Power = \dfrac{0.53}{0.304} kJ/s = 1.743 kJ/s or 1.743 kW.

a) Efficiency = \dfrac{ Work \ done}{Energy\ input}

Efficiency = \dfrac{ 0.53k J}{1.71kJ} \approx 0.3099 \approx 31 %.

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